ELUPS topology - Line Interactive vs Online
The two main UPS topologies, Line Interactive (single conversion) and Online (double conversion): how each one works and why the right choice matters.
A UPS topology is defined by the basic design of how the UPS operates. The UPS units mainly sold on the market today come in two types of topology: Line Interactive and Online. These two basic topologies work differently and, if the wrong one is chosen, can affect the protected device or the cost of the UPS.
Single Conversion - Line Interactive
Under normal conditions, these UPS systems take power from the grid (AC) and supply the connected devices directly. If the supply (AC) goes outside the permitted limits, the UPS inverter stops the direct supply and starts supplying power from the batteries until the supply is restored or the batteries are depleted. Tescom offers the well-known LEO series with Line Interactive topology.
Double Conversion - Online
UPS systems with this topology convert power twice. First, an input rectifier converts AC power to DC and feeds the output inverter. Then the output inverter processes and stabilizes the AC supply before sending it to the UPS output.
This double-conversion process completely isolates critical loads from raw utility power, ensuring that the supported equipment receives only clean, reliable electricity. In normal operation, a double-conversion UPS continuously processes power twice. If, however, the alternating current (AC) input supply goes outside the permitted limits, the input rectifier shuts off and the output inverter starts drawing energy from the battery. The UPS continues to use battery power until the AC input returns to the permitted limits or the batteries are depleted. Discover Tescom's Online UPS systems here .
Learn more about how to choose the UPS topology that will support you properly and cost-effectively here.
